Electric switch



March 27, 1928.

N. G. COPLEY ELECTRIC SWITCH Filed June 2'7, 1925 INVENTOR ATTORNEY Patented Mar, 27, 1928.

UNITED STATES PATENT OFFICE.

NOIBERTO GUY COPLEY, 015 DETROIT, MICHIGAN, ASSIGNOR TO SUNNY LINE APPLI- ANCES, INCORPORATED, OF DETROIT, MICHIGAN, A CORPORATION OF DELAWARE.

ELECTRIC SWITCH.

The present invention relates to electric switches and specifically to that type of switch wherein the circuit is broken automatically under conditions of overloading.

Among the objects of this invention is a switch which issmall, compact, economically constructed, efficiently operating and one which 'is easy to install.

The invention will best be described by referring to the accompanying drawing, in

' which:

Fig. 1 is a side elevation of the switch mechanism with the parts in closed circuit position.

.open circuit position.

Fig. 3 is a bottom plan view of Fig. 1.

Fig. 4: is a view similar to Fig. 1 with parts in section and enlarged.

2 As indicated, the switchv consists of a base 10 upon which is mounted a U-shaped' bracket 11, between the arms of which is a coil 12. Coil 12 is provided with a hollow cylindrical core 13 which projects through and is in contact with one of the arms of the bracket as at 14. The other end of core 13 projects through the other arm of the bracket as shown at 15 and is fiush with the outer surface of the arm. This end of the core is s aced from the metal ofthe arm and insulate therefrom by the layer of insulation 16 upon which the coil is wound. Thismakes an electro-magnet of which the core end at 15 is one pole whilethe bracket is the other. 1 c

The hollow core 13 serves as a guide for a rod 20 which is somewhat longer than the core and which carries at one end the armature 21in the form of a disc.

Carried on the arm of bracket 11 adjacent the magnet poles is another bracket 25 to which is hinged a link 26 spring-pressed upwardly by coil spring 30. To the free end of link 26 is hinged another link 27 forming one part of a toggle joint. The other part being formed by link 28 hinged to link 27 at one end and to the second] arm. of bracket 11 at 29.

The toggle joint is so arranged that it nfay Fig. 2 is a similar view with the parts in be pushed over center by means of a button 31 attached to its center, the overthrow being limited by the adjacent arm of bracket 11, and the joint being held by spring 30.

It may then be returned to its outer position by means of a button 32 acting on an extension 33 of link 28 beyond point 29.

Also secured to link 26 is a spring contact finger 35 which is adapted to have its free end pressed against a second contact member 36 when the togglejoint is operated by button 31 to its overthrow position. -Thiscompletes the circuit through the switch, which circuit is in through lead 40, around the coil 12, to finger 35 and contact 36 to, which latter is attached lead 41, both leads 5 being taken out through a hole 42 in the base 10.

The operation of the automatic breaker is as follows:

The magnet and its armature 21 are so constructed and adjusted that, when normal current passes'through the switch, the magnet will be energized, but insufficiently to exert enough pull on the armature to cause the rod 20 to throw back the toggle over center and allow the contacts 35 and 36 to separate. As soon, however, as overloading of the circuit occurs and an excess current asses through the coil, the pull upon the arm ture increases and through rod 20 pushes the toggle back over center and allows the contacts to separate and break the circuit.

The adjustmentof the magnet and arma ture is. accomplished by the limiting screw 50 carried by a bracket 51 and so located as to limit the outward movement of armature 21.

The switch'mechanism iscpreferably covered by a housing 60 provided with openings 61 and 62 through which project the buttons 31 and 32 respectively.

It should, be noted that this invention is not to be limited to the specific construction shown as this may be departed from'without departing from the claim which follows;

A switch consisting of an insulating base having mounted thereon a bracket carrying a, coil of insulated wire connected at one end to a lead-in Wire and at its other end to a spring contact finger pivotally mounted on said bracket, said coil having a hollow cylin- '5 drical core, toggle mechanism on said bracket for moving the finger into contact with n ffixed contact also mounted on the base, the

rcefeeeo toggle lacing constructed to move over center When contact is made, and an armature guided in the said hollow core adapted to operate as e plunger to move back the toggle and break the circuit when excess current flows through the coil.

NUIBERTO GUY CQPLEY. 

